File downloaded from ASUS Download Center site:
BIOS Version 210
Download the G750JZAS210.zip file, then unzip and extract the file G750JZAS.210, transfer copy to FAT32 formatted USB, use EZFlash in BIOS to upgrade.
What program are you opening when you do this procedure...……..EZFlash!
Looks like you need to establish what model you have. G750JZ or G750JZA. You don't know?
Try all combinations. Keep in mind, you have two different BIOSs, depending on the model, BIOS G750JZAAS.210 (G750JZA.bin and G750JZAAS.bin) and BIOS G750JZAS.210 (G750JZ.bin and G750JZAS.bin). Don't mix them up.
You do know you have to hold down the buttons for about a minute?
Have you unplugged the laptop from the charging brick, removed battery, held power button on for a couple minutes? Install battery, attach charging brick, normal power up?
As a last effort, remove CMOS battery from motherboard Replace the CMOS battery.
If that doesn't change anything, then get a RMA from ASUS and return the laptop to ASUS for repair.
Looking on the Internet, there seems to be many such problems with the G750xx model laptop.
One final thought on this whole situation...
This emergency bios recovery technique really should have been included in the official User Guide documentation included with the laptop. Whoever wrote the User Manual should be fired for not including this vital information.
Not only would it have kept a large number of laptops from being returned to ASUS (which, of course, costs ASUS money), it would have greatly enhanced the user's experience of using the laptop, and would have avoided un-necessary user frustration.
Additionally, this issue is a very wide problem; pretty much every owner of the G750 series of laptops will experience this problem at some point. And it's an engineering flaw. If a guy returned his laptop under warranty because of this problem, ASUS would replace it with a laptop with the same engineering flaw, ensuring that at some point, the user will experience the exact same issue. The way that ASUS has (or rather, hasn't) handled this issue speaks volumes.
Personally, I'm done with ASUS hardware, and when my G750JZ finally bites it, it'll be replaced with a competitor's machine.